Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
Processing...

Test String

Code Generator

Language

Generated Code

use strict; my $str = '{ [-] logger: org.mule.runtime.core.internal.exception.OnErrorPropagateHandler message: ******************************************************************************** Message : \'until-successful\' retries exhausted Element : bmw-sl-nsp-case-readSub_Flow/processors/1 @ bmw-sl-nsp-prd-api:write/bmw-sl-nsp-case-read.xml:88 (Until Successful) Element DSL : <until-successful maxRetries="${max.retries}" doc:name="Until Successful" doc:id="b76dd101-8752-43aa-ab94-d548b699ea7a" millisBetweenRetries="${time.between.retires.case}"> <http:request method="GET" doc:name="Get Cases" doc:id="b846734d-4ff0-479d-bc21-e112cd9e8919" config-ref="HTTP_Request_configuration" path="${schedular.getcases.target.path}" sendCorrelationId="ALWAYS" correlationId="#[correlationId]"> <http:query-params><![CDATA[ #[output application/java --- { "startTimestamp" : vars.startTimestamp, "country" : vars.currentCountry, "endTimestamp" : vars.endTimestamp, "businessUnit" : vars.currentBusinessUnit }]'; my $regex = qr/Message\s+:\s+(?<message>.+)/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html